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Narrow-gauge railways are railroads (railways) where the distance between the two parallel rails constituting the railway track (the track gauge) is less than the 1435 mm (4 ft 8.5 in) of standard-gauge railroads. In practice, most presently existing narrow-gauge railroads have gauges of 1067 mm (3 ft 6 in) or less. The rationale for the use of a narrower gauge is that a railway using such a gauge can be substantially cheaper to build, equip, and operate than one employing the standard gauge. On the other hand, standard-gauge railroads have a greater haulage capacity and allow greater speeds than those a narrow-gauge system can ever hope to attain.